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import base64
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import hashlib
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import rsa
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from Crypto.Cipher import AES, DES3
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from Crypto.Hash import SHA256
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from Crypto.PublicKey import RSA
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from Crypto.Signature import PKCS1_v1_5
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from pyDes import ECB, PAD_PKCS5, des
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def createcip(path, op):
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# 传输的文件
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filename = path
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# 加密对称密钥
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with open("../server/Bpubkey.pem", mode="rb") as f:
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pub = f.read()
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pubkey = rsa.PublicKey.load_pkcs1(pub)
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message = "12345678" if op == "DES" else "1234567812345678"
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info = rsa.encrypt(message.encode("utf-8"), pubkey)
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with open("encryptedkeyfile.bin", "wb") as key_file: # 生成加密文本encryptedkeyfile
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key_file.write(info)
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# 加密文件 DES算法加密
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with open(filename, "r", encoding="utf-8") as f:
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plaintext = f.read()
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x = plaintext
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while len(x) % 16 != 0: # 如果text不足16位的倍数就用空格补足为16位
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x += "\0"
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x = x
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if op == "DES":
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SECRET_KEY = message
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print(len(message))
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iv = SECRET_KEY
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des_obj = des(SECRET_KEY, ECB, iv, padmode=PAD_PKCS5)
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secret = des_obj.encrypt(x)
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elif op == "AES_ECB":
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SECRET_KEY = message.encode()
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aes_obj = AES.new(SECRET_KEY, AES.MODE_ECB)
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secret = aes_obj.encrypt(x.encode())
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elif op == "AES_CBC":
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iv = message.encode()
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SECRET_KEY = message.encode()
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aes = AES.new(SECRET_KEY, AES.MODE_CBC)
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secret = aes.encrypt(x.encode())
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with open("encryptedfile.txt", "wb") as cip: # encryptedfile
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cip.write(secret)
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# 计算摘要值以及签名
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out1 = hashlib.sha256(plaintext.encode('"utf-8"')).hexdigest()
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out1 = out1.encode("utf-8")
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privkey_key_file = open("./Aprivkey.pem", "rb").read().decode("utf-8")
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# 导入公钥，返回一个RSA秘钥对象
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private_key = RSA.importKey(privkey_key_file)
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h = SHA256.new(out1)
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signer = PKCS1_v1_5.new(private_key)
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signature = signer.sign(h)
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# 对需要加密的消息进行PKCS#1 v1.5加密，再使用Base64对类似字节的对象进行编码。
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sig = base64.b64encode(signature)
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with open("sigfile.bin", "wb") as f: # 生成签名文件sigfile
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f.write(sig)
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